Can I make insects crawl over a body and envelope them?

I want to use PI to make a scene like in the mummy where the scarab bettles envelope the guy completely and it looks like the actor is made of moving beetles. Is this possible with a moving actor on a greenscreen?

I don't think the "insects crawling up the body" part would be simple in pIllusion, although it might be possible depending on the details of the shot. Having the bugs already covering the body is possible, but it will still require a lot of work, and some masking work in your compositing app.

Although if you want it to look like the bugs are crawling around the person (crawls from their front, around their sides, to the other side) it won't look right in pIllusion -- you'll want to use a 3D app for that.

Even if you do use pIllusion, you'll need an animated image sequence of a bug crawling.

Once you got the emitter working in PI, then you could easily render out an image sequence of bugs moving across the frame and use that to map onto a 3d stand in of your character. Alas, not in PI alone.